1. UNICEF data: neonatal Mortality. United Nations Children's Fund. 2021. Available at: https://data.unicef.org/topic/child-survival/neonatal-mortality/. Accessed September 29, 2022.
2. Global, regional, and national estimates of levels of preterm birth in 2014: a systematic review and modelling analysis;Chawanpaiboon;Lancet Glob Health,2019
3. Epidemiology and causes of preterm birth;Goldenberg;Lancet,2008
4. WHO recommendation on calcium supplementation before pregnancy for the prevention of pre-eclampsia and its complications,2020
5. WHO antenatal care recommendations for a positive pregnancy experience. Nutritional interventions update: multiple micronutrient supplements during pregnancy,2020